#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @FileName  :remember_me.py
# @Time      :2021/4/8 16:49
# @Author    :Letquit
"""
文件说明：

"""
import json
def get_stored_username():
    filename = 'username.json'
    try:
        with open(filename) as f_obj:
            username = json.load(f_obj)
    except FileNotFoundError:
        return None
    else:
        return username

def get_new_username():
    username = input('What is your name? ')
    filename = 'username.json'
    with open(filename, 'w') as f_obj:
        json.dump(username, f_obj)
    return username

def greet_user():
    username = get_stored_username()
    if username:
        print('Welcome back, ' + username + "!")
    else:
        username = get_new_username()
        print("We'll remember you when you come back, " + username + "!")


greet_user()
if __name__ == "__main__":
    run_code = 0
